Analytical Modeling of PEM Fuel Cell Gas Diffusion Layers Deformation under Compression: Part 2 - Nonlinear Behaviour Region

2014 ◽  
Vol 61 (11) ◽  
pp. 13-23 ◽  
Author(s):  
V. Norouzifard ◽  
M. Bahrami
Keyword(s):  
Fuel Cell ◽  
Analytical Modeling ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Nonlinear Behaviour ◽  
Gas Diffusion Layers ◽  
Diffusion Layers

Numerical Simulation of Droplet Emergence and Growth From Gas Diffusion Layers (GDLs) in Proton Exchange Membrane (PEM) Fuel Cell Flow Channels

2018 ◽  
Author(s):  
Jingru Benner ◽  
Mehdi Mortazavi ◽  
Anthony D. Santamaria
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Pem Fuel Cell ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Gas Diffusion Layers ◽  
Diffusion Layers ◽  
Flow Channels ◽  
Exchange Membrane ◽  
Over Time

Liquid water management is critical for Proton Exchange Membrane (PEM) fuel cell operation, as excessive humidity can lead to flooding and cell performance degradation. Water is produced in the cathode catalyst layer during the electrochemical reaction. If reactant gas streams become saturated, liquid water forms and must travel through anode and cathode Gas Diffusion Layers (GDLs) to reach flow channels for removal. Understanding the dynamic behavior of the droplet is critical to improve water removal strategies for PEM fuel cells. In this study a 3D, transient, two-phase model based on the Volume of Fluid (VOF) method was developed to study a single droplet in the gas channel. The formation, growth, and breakup of the droplet is tracked numerically and analyzed. The pressure drop across the droplet is monitored over time and compared with theoretical analysis. The droplet size and shape change over time for two different pore sizes are compared. The impact of various gases including air, helium, and hydrogen on droplet dynamics is presented. The viscous force and pressure force on the droplet and the drag coefficient are calculated.

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